Question just wondering. Updated!

I’m a week late on my period. I took a test the second day I was late and it was the clear blue. It came back negative. So I was like good. But I haven’t started yet and I talked to one of my friends and she said I need to wait and test again because sometimes they give off wrong answers and it’s better to wait till your a week let. So should I test again or just wait till my period that should of been here already. I have a blood problem so I don’t have BC I did but it hurt me because it was the copper iud. I was sleeping with my ex and then had a drunken hook up unprotected. Yes I know my fault I don’t want to hear bad comments. I just want to know if I should test again or stop stressing and wait?

Update. I took a test this morning and it came back negative again. Should I just keep testing till my period comes? Or should I not worry now. Since that’s the second negative?